Atmel Germany Gmbh

Hans-Werner Groh

Wolfgang Roeper

Hans-Peter Waible

Reinhard Reimann

Horst Haefner

Juergen Schnabel

Burkhard Gehring

Hermann Hammel

Friedemann Schmidt

Thorsten Fahlbusch

Gerald Krimmer

Juergen Eckert

Michael Hecker

Wolfgang Schneider

Michael Vogt

A d.c. signal controlled oscillator includes a frequency-determining network having a control input and a modulation input. A phase regulating loop includes the oscillator and components that provide a control signal to the control input. A circuit apparatus for driving the oscillator includes a modulation generator that provides a modulation signal to the modulation input, and a circuit arrangement that autonomously generates a signal depending on and representing a slope of the modulation and provides this slope signal to the modulation generator, which generates the modulation signal dependent on the slope signal. A method of operating the oscillator involves switching a frequency divider successively to two different frequencies, respectively sampling and holding the two different arising control voltages, forming a difference between the two control voltages, and activating the modulation generator so that a modulation swing of the modulation signal is determined by this difference between the control voltages.

Method and apparatus for driving a direct current or voltage controlled oscillator with modulation slope feedback

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Ensdorf, Germany

Hans-Werner Groh